Vertical pellet dryer

Abstract

The utility model provides a vertical pellet drying machine. The vertical pellet drying machine comprises a plurality of independent box bodies used for containing pellets, hot air inlet pipelines communicated with the bottoms of the independent box bodies, exhaust pipelines communicated with the tops of the independent box bodies and vent pipes. The plurality of independent box bodies are arranged in an array, and a box body gap is reserved between every two adjacent independent box bodies; a plurality of vent holes are formed in the pipe wall of the vent pipe, and the vent pipe extends into the independent box bodies at the same time; a feeding port is formed in the top of each independent box body, and a discharging port is formed in the bottom of each independent box body. According to the technical scheme, an existing integral box body is divided into a plurality of independent box bodies, and the independent box bodies are connected through the vent pipes, so that uniform distribution of heat in the whole drying area is promoted, energy loss is reduced, and heat efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pellet preparation, in particular to a vertical pellet drying machine. Background Art

[0002] In the industrial production process, material drying is a basic and key process step, and its efficiency and quality directly affect the cost and output quality of the entire production process. Traditional drying technology faces many challenges, such as high energy consumption, long drying time, uneven drying effect, etc. These problems seriously restrict the efficiency and sustainable development of industrial production. As a kind of drying equipment, vertical dryer has developed rapidly due to its compact structure, small footprint, and easy operation. Especially in the metallurgical, steel, environmental protection and other industries, pellet preparation is an important task, and in the pellet preparation process, pellet drying is an important process, so vertical dryer has been widely used in pellet preparation.

[0003] In the process of implementing the present utility model, the inventors found that there are at least the following problems in the prior art:

[0004] The existing vertical pellet dryer does not fully consider the flow and distribution of hot air. It only has an integral box, and the pellets to be dried are stacked in this integral box. The heat energy is not fully utilized during drying. The hot air mainly flows along the side walls of the box. The side walls of the box get the most heat, while the middle part of the box has little heat distribution, resulting in low energy utilization efficiency, large heat loss, and energy waste. Therefore, how to optimize the vertical pellet dryer to improve its energy utilization efficiency is a problem that needs to be solved. Utility Model Content

[0005] The embodiment of the utility model provides a vertical pellet dryer, so that the heat energy can be fully utilized during drying, thereby improving the energy utilization rate of the pellet dryer.

[0006] To achieve the above-mentioned purpose, an embodiment of the utility model provides a vertical pellet dryer, comprising: a plurality of independent boxes for accommodating pellets, a hot air inlet duct connected to the bottom of the independent box, an exhaust duct connected to the top of the independent box, and an air vent; a plurality of independent boxes are arranged in an array, with a box gap between every two adjacent independent boxes; a plurality of air holes are opened on the wall of the air vent, and the air vent extends into a plurality of independent boxes at the same time; a feed port is provided on the top of each independent box, and a discharge port is provided at the bottom of each independent box.

[0007] Furthermore, the vertical pellet dryer also includes an outer wall mounted on the outside of the independent box body, and a side wall gap is left between the outer wall and the outer edge of the array formed by multiple independent boxes; a top sealing plate is connected between the top of the outer wall and the top of the independent box body, and a bottom sealing plate is connected between the bottom end of the outer wall and the bottom end of the independent box body; the exhaust pipe extends into an independent box body, the hot air inlet pipe is connected to the side wall gap, and the end of the air vent pipe is connected to the side wall gap.

[0008] Furthermore, there are six independent boxes in total, and the six independent boxes are arranged in two rows and three columns.

[0009] Furthermore, a plurality of ventilation pipes distributed vertically are arranged in the same row, and the ventilation pipes penetrate through a plurality of independent boxes located in the same row.

[0010] Furthermore, a lower connecting sealing plate is connected between the bottoms of two adjacent independent boxes, and an upper connecting sealing plate is connected between the tops of two adjacent independent boxes.

[0011] Furthermore, a communication hole is provided on the top side wall of the independent box body.

[0012] Furthermore, the air permeable tube is formed by connecting the top tube wall, the first side tube wall and the second side tube wall in sequence, the top tube wall is an arc-shaped structure protruding upward, the first side tube wall and the second side tube wall are both straight surfaces, and the first side tube wall and the second side tube wall are symmetrical along the mid-vertical plane of the air permeable tube; the air holes are opened on the first side tube wall and the second side tube wall.

[0013] Furthermore, the included angle between the first side tube wall and the second side tube wall is 45° to 80°.

[0014] Furthermore, guide plates are provided at both ends of the air vent, and the guide plates are arranged obliquely in the gap between the side walls. The side of the guide plate located at a high position is connected to the outer side of the independent box body, and the side of the guide plate located at a low position is connected to the inner side of the outer wall; the side of the guide plate located at a high position is higher than the top tube wall, and the side of the guide plate located at a low position is lower than the top tube wall.

[0015] Furthermore, the discharge port is a cone barrel structure that is larger at the top and smaller at the bottom, a humidity sensor is arranged in the discharge port, and a vibration device is arranged on the outer side of the barrel wall of the discharge port.

[0016] The above technical solution has the following beneficial effects:

[0017] In the present technical solution, the layout makes full use of space resources. By arranging partitions on the inside, the integral box is divided into multiple independent boxes. The independent boxes are preferably arranged in six numbers. The six independent boxes are cleverly designed into two rows of symmetrical layouts, with three independent boxes in each row, and the air vents extend directly into the independent boxes. In this way, each independent box can directly receive heat supply, avoiding the situation in the prior art where the integral box has very little heat in the middle and much heat on the sides. Therefore, the hot air is distributed more evenly and the heating efficiency is improved. That is, the hot air circulation design is optimized to form a new heat exchanger, which promotes the uniform distribution of heat in the entire drying area, effectively improves the thermal energy utilization rate, and reduces energy consumption.

[0018] In addition, this technical solution also has the following characteristics:

[0019] 1) In the traditional drying process, the material often has inconsistent drying effects due to problems such as uneven airflow distribution or material accumulation inside the dryer. Some materials are over-dried while the humidity of other parts is still high, thus affecting the product quality. After adopting this technical solution, the hot air is more evenly distributed, which ensures that the material is evenly heated during the drying process and the consistency of product quality is ensured.

[0020] 2) In this solution, in order to strengthen the integrity of the dryer box and optimize the hot air flow path, guide plates are also installed. The design of these guide plates not only improves the structural stability of the dryer, but also further improves the thermal efficiency and improves the uniformity of material drying by improving the hot air flow path. This connection method simplifies the internal structure, reduces the loss of heat energy during the transfer process, and improves the overall drying efficiency.

[0021] 3) Each box is equipped with an inverted triangle ventilation pipe, with multiple ventilation holes on both sides. Through the guiding effect of the inverted triangle pipe, the hot air can be more evenly diffused to all parts of the box, promoting uniform heating of the material. This innovative internal ventilation pipe layout design optimizes the hot air distribution, which not only improves the drying efficiency, but also ensures the consistency of the final product quality.

[0022] 4) In order to achieve more efficient use of heat energy, hot air enters the equipment from the side and is dispersed through a specially designed blower and air vent system to ensure that the hot air passes through the material layer evenly. Subsequently, the hot air is discharged through the exhaust pipe at the top in a slightly negative pressure manner, forming a closed-loop hot air circulation system, which greatly reduces energy loss and improves thermal efficiency.

[0023] 5) The system is equipped with an inverted cone-shaped discharge port at the bottom, a humidity sensor and an automatic vibration discharge device. The humidity sensor monitors the humidity of the pellets and adjusts the operation of the vibration discharge mechanism in real time, thereby realizing the function of automatically adjusting the discharge rate according to the humidity of the pellets. This automatic control not only improves the operating efficiency, but also ensures the stability of the product drying quality.

[0024] 6) The symmetrical placement of two rows of independent boxes helps to maintain the balance of the entire equipment, thereby improving the stability of the equipment and reducing structural damage that may be caused by vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a front view schematic diagram of a vertical pellet dryer according to an embodiment of the utility model;

[0027] Figure 2 It is a side schematic diagram of a vertical pellet dryer according to an embodiment of the utility model;

[0028] Figure 3 This is a schematic diagram of a plurality of independent boxes in an embodiment of the utility model from a top view;

[0029] Figure 4 This is a diagram showing the position relationship between the air vent and the guide plate in the embodiment of the utility model;

[0030] Figure 5 This is a schematic diagram of the structure of the air-permeable tube in the embodiment of the utility model;

[0031] Figure numbers: 1. Exhaust duct; 2. Box gap; 3. Independent box; 4. Upper connecting sealing plate; 5. Side wall gap; 6. Outer wall; 7. Guide plate; 8. Air vent; 9. Air vent; 10. Hot air inlet duct; 11. Blower; 12. Vibration device; 13. Discharge port; 14. Bottom sealing plate; 15. Lower connecting sealing plate; 16. Feed port; 17. Top sealing plate; 18. Draft fan; 20. Connecting hole; 81. Top pipe wall; 82. First side pipe wall; 83. Second side pipe wall. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] like Figure 1 As shown, an embodiment of the utility model provides a vertical pellet dryer, comprising a plurality of independent boxes 3 for accommodating pellets, a hot air inlet pipeline 10 connected to the bottom of the independent box 3, an exhaust pipeline 1 connected to the top of the independent box 3, and an air vent 8; the plurality of independent boxes 3 are arranged in an array, and a box gap 2 is left between every two adjacent independent boxes 3; a plurality of air holes 9 are opened on the wall of the air vent 8, and the air vent 8 extends into the plurality of independent boxes 3 at the same time; a feed port 16 is provided on the top of each independent box 3, and a discharge port 13 is provided at the bottom of each independent box 3.

[0034] In order to solve the above problems, the present technical solution no longer uses the existing integral box structure, but splits it into multiple independent boxes 3, and arranges multiple independent boxes 3 in an array. In this way, after the hot air passes through the blower 11, it enters the dryer from the hot air intake pipe 10, and each independent box 3 can directly receive heat supply, avoiding the situation that the central part of the integral box of the prior art often has very little heat and the side part has a lot of heat, so the hot air is distributed more evenly and the heating efficiency is significantly improved; at the same time, the present application also provides a ventilation pipe 8 that crosses multiple independent boxes 3, and multiple ventilation holes 9 are opened on the pipe wall of the ventilation pipe 8, so that the hot air can be input into the multiple independent boxes 3 and directly contact the pellets inside the independent boxes 3, so that the hot air can be distributed more evenly, and the pellets originally accumulated in the middle part can also get enough heat, which promotes the uniform distribution of heat in the entire drying area, effectively improves the utilization rate of thermal energy, and reduces energy consumption.

[0035] Furthermore, the vertical pellet dryer also includes an outer wall 6 which is sleeved on the outside of the independent box body 3, and a side wall gap 5 is left between the outer wall 6 and the outer edge of the array formed by the multiple independent box bodies 3; a top sealing plate 17 is connected between the top of the outer wall 6 and the top of the independent box body 3, and a bottom sealing plate 14 is connected between the bottom end of the outer wall 6 and the bottom end of the independent box body 3; the exhaust pipe 1 extends into one of the independent box bodies 3, the hot air inlet pipe 10 is connected to the side wall gap 5, and the end of the air vent pipe 8 is connected to the side wall gap 5.

[0036] In the prior art, the hot air intake pipe 10 is directly passed into the interior of the integral box. In this way, there is only one hot air input port, and the heat is more concentrated near the input port. The hot air mainly flows along the side wall of the box, and the middle part obtains less heat, so it is difficult to make the heat distribution uniform. In the present application, a hollow side wall gap 5 (such as Figure 2 As shown), a top sealing plate 17 and a bottom sealing plate 14 are used to seal the outside of the independent box 3 and the outer wall 6, thereby forming a rectangular hollow ring, and the interior of the rectangular hollow ring includes a plurality of box gaps 2. After hot air enters from one end, it can flow along the side wall gap 5 and the box gap 2, thereby filling the space, so that the side wall of each independent box 3 can directly receive heat; at the same time, the hot air can also directly enter the interior of the independent box 3 along the two ends of the air vent 8, and directly transport the heat to the pellet material inside, so that the heat distribution is very uniform and the efficiency is greatly improved.

[0037] Furthermore, there are six independent boxes 3, which are arranged in two rows and three columns. The six independent boxes 3 are cleverly designed into a structure with two rows of symmetrical layouts and three boxes in each row. At the same time, the setting of multiple rows of boxes and symmetrical arrangement helps to maintain the balance of the overall equipment, thereby improving the stability of the equipment and reducing structural damage that may be caused by vibration.

[0038] Furthermore, a plurality of the ventilation pipes 8 distributed vertically are arranged in the same row, and the ventilation pipes 8 penetrate through the plurality of the independent boxes 3 located in the same row.

[0039] The design of multiple rows of air vents 8 (preferably 3 rows) allows more air vents 9 to be distributed in each independent box 3, so that more pellets are in direct contact with the hot air, which helps to evenly distribute heat and improve thermal energy utilization.

[0040] Furthermore, a lower connecting sealing plate 15 is connected between the bottoms of two adjacent independent boxes 3, and an upper connecting sealing plate 4 is connected between the tops of two adjacent independent boxes 3. The lower connecting sealing plate 15 and the upper connecting sealing plate 4 are both located at the connection between the two independent boxes 3, and can serve as connecting parts between the adjacent independent boxes 3 to maintain the stability of the structure, and can also seal the top and bottom of the box gap 2 to ensure that hot air does not overflow; at the same time, Figure 1 , Figure 2 As shown, the lower connecting sealing plate 15 and the upper connecting sealing plate 4 are both designed to be an upwardly arched right-angle shape as shown in the figure. This design can ensure that after the hot air reaches the top, the upper connecting sealing plate 4 guides the hot air to flow downward, and then flows back upward again through the guidance of the lower connecting sealing plate 15, forming a circulating flow path, which is more conducive to achieving a uniform drying effect.

[0041] Furthermore, a communication hole 20 is provided on the top side wall of the independent box body 3. Figure 1 As shown, under the action of the induced draft fan 18, the hot air in the vertical pellet dryer will be discharged along the exhaust duct 1, and a plurality of independent boxes 3 have been arranged in the dryer. If the exhaust duct 1 is to be connected to each independent box 3 separately, the structure will obviously be complicated. For this reason, in the present application, a connecting hole 20 is provided on the top side of the independent box 3, so that the hot air that has completed the drying work can be gathered together at the top, and then gathered in the independent box 3 connected to the exhaust duct 1, and discharged together along the exhaust duct 1.

[0042] Furthermore, the air permeable tube 8 is formed by connecting a top tube wall 81, a first side tube wall 82 and a second side tube wall 83 in sequence, the top tube wall 81 is an arc-shaped structure protruding upward, the first side tube wall 82 and the second side tube wall 83 are both straight surfaces, and the first side tube wall 82 and the second side tube wall 83 are symmetrical along the mid-vertical plane of the air permeable tube 8; the air holes 9 are opened on the first side tube wall 82 and the second side tube wall 83.

[0043] Depend on Figure 5 It can be seen that the air pipe 8 is a porous inverted triangle shaped tube, and the particularities of the air pipe 8 include: a. The air pipe 8 is in the shape of an inverted triangle, and its arc-shaped top tube wall 81 is wider and the bottom is narrower, so as to realize the concentrated injection of hot air and the penetration into the material layer; b. There are multiple air holes 9 evenly distributed on the surface of the first side tube wall 82 and the second side tube wall 83 below, and the aperture size and distribution density of the air holes 9 can be adjusted according to the characteristics of the pellets and the drying requirements to achieve uniform distribution of hot air and reduce local overheating; c. The material of the air pipe 8 is a high temperature resistant and corrosion resistant material, including but not limited to stainless steel, alloy or ceramic materials, to ensure long-term stable operation in a high temperature environment.

[0044] Furthermore, the angle between the first side tube wall 82 and the second side tube wall 83 is 45° to 80°. According to tests, when the air-permeable tube 8 is designed with such a structure, better effects can be achieved.

[0045] Furthermore, guide plates 7 are provided at both ends of the air vent 8, and the guide plates 7 are arranged obliquely in the side wall gap 5, the side of the guide plate 7 located at a high position is connected to the outer side of the independent box body 3, and the side of the guide plate 7 located at a low position is connected to the inner side of the outer wall 6; the side of the guide plate 7 located at a high position is higher than the top tube wall 81, and the side of the guide plate 7 located at a low position is lower than the top tube wall 81.

[0046] like Figure 1 and Figure 4As shown, the guide plate 7 is arranged at the positions corresponding to the two ends of the air vent 8, which is used to block the hot air, forcing the hot air to enter the air vent 8 in the bottom row first, and then the remaining hot air flows upward along the side of the guide plate 7 (the width of the guide plate 7 is less than the width of each row of independent boxes 3) in the side wall gap 5, enters the air vent 8 in the upper row, and rises layer by layer until the air vent 8 in the top row, so that the air vent 8 near the bottom can obtain more heat, thereby meeting the actual needs of pellet drying (in the drying process, the pellets near the bottom discharge port 13 need more heat); if there is no shielding of the guide plate 7, due to the low density of hot air, the heat will be more distributed at the top, so that the bottom air vent 8 obtains the least hot air, affecting the drying effect of the entire device. Therefore, the position and angle of the guide plate 7 need to be accurately calculated and designed, which is one of the key factors to achieve efficient hot air distribution, and can ensure that the hot air can flow through each independent box 3 evenly and effectively. The angle design of the guide plate 7 takes into account the natural flow characteristics of the hot air and the aerodynamics inside the dryer cabinet. The angle of the guide plate 7 is set to form an angle of 30° to 45° with the horizontal plane. Such an angle can effectively guide the hot air to flow in the side wall gap 5, reduce the resistance to air flow, increase the contact time between the hot air and the pellets, and improve the drying efficiency.

[0047] Furthermore, the discharge port 13 is a cone-barrel structure with a large upper portion and a small lower portion, a humidity sensor is provided in the discharge port 13, and a vibration device 12 is provided on the outer side of the barrel wall of the discharge port 13. The combination of the cone-barrel structure, the humidity sensor, and the vibration device 12 can realize automatic adjustment of the discharge rate according to the humidity of the pellets, thereby improving the operating efficiency and ensuring the stability of the product drying quality.

[0048] In addition, for the external surface of the dryer (i.e., the outer side of the outer wall 6), a method of spraying a multilayer thermal insulation composite coating is adopted. The thermal insulation composite coating composition includes but is not limited to nano hollow microspheres, aluminum oxide, silicon oxide, titanium dioxide, etc., has excellent thermal resistance performance, can significantly reduce heat loss, thereby improving energy utilization efficiency.

[0049] The present invention is described in detail with a specific embodiment below:

[0050] 1) Material selection and size design: In this specific embodiment, the independent box 3 is made of high temperature resistant stainless steel material, specifically 310S, to ensure long-term stable operation in a high temperature environment. The size of each independent box 3 is 1000mm long, 1000mm wide, and 2000mm high, with sufficient internal space to accommodate the pellets to be dried. The box wall thickness is 5mm, which not only ensures the firmness of the structure, but also reduces unnecessary heat loss.

[0051] 2) Box production and connection: Each independent box 3 is formed by CNC laser cutting of stainless steel plate, and then connected into a whole by argon arc welding process to ensure the sealing and strength of the weld. The connection between the independent boxes 3 uses a special guide plate, which is also made of stainless steel material, with a size of 1000mm long and 200mm wide, and is connected by welding. The design of the guide plate takes into account the flow characteristics of hot air to ensure that the hot air can be evenly distributed.

[0052] 3) Automatic control system

[0053] The automatic control system includes a high-precision humidity sensor, a temperature sensor, a PLC controller and a touch screen operation interface. The humidity sensor is installed near the discharge port 13 of each independent box 3 to monitor the humidity of the material in real time. The temperature sensor is distributed inside the independent box 3 to monitor the temperature of the hot air. The PLC controller automatically adjusts the wind speed of the blower, the power of the heater, and the frequency and intensity of the vibration device 12 according to the data of the sensor. The touch screen operation interface is provided to the operator for parameter setting and monitoring to ensure accurate control of the drying process.

[0054] 4) Process parameter setting

[0055] Taking the drying of dust-removed ash cold-pressed pellets as an example, the drying time is set to 2 hours and the drying temperature is set to 120°C. Before the drying starts, the time and temperature parameters are set through the touch screen operation interface. During the drying process, the PLC controller automatically adjusts the operating state of the hot air circulation system according to the real-time monitored humidity and temperature data. At the end of the drying time, the humidity sensor detects that the humidity of the pellets has dropped below the preset value, and the PLC controller automatically stops heating and blowing, and starts the vibration device 12 at the same time to discharge the dried pellet material smoothly.

[0056] Through the above specific implementation, the vertical pellet dryer of the utility model not only achieves efficient and uniform drying effect, but also improves the convenience of operation and precise control of the drying process through the automatic control system. The dryer is suitable for drying a variety of materials and has broad application prospects and market value.

[0057] In summary, this technical solution adopts a flow-guiding interlayer vertical drying method. Compared with the traditional drying method, it has the characteristic of uniform heating of the pellet materials. The reasons are: 1. The flow-guiding interlayer avoids the shortcomings of slow and uneven heat dissipation of the traditional single-layer box drying. The flow-guiding interlayer allows the pellets to be evenly heated around the box, which greatly improves the product quality and overcomes the problem of large fluctuations in product moisture in the traditional drying method. 2. An air vent 8 with holes and a nearly triangular shape is provided inside to further promote the uniform dispersion of hot air inside the pellets, making the drying more efficient. At the same time, the top surface of the air vent 8 adopts an arc design to avoid the problems of hanging and stuck materials.

[0058] At the same time, the technical solution also has the characteristics of low energy consumption and small footprint, the reasons are: 1. Multi-layer thermal insulation composite coating, the composition of the thermal insulation composite coating includes but is not limited to nano hollow microspheres, aluminum oxide, silicon oxide, titanium dioxide, etc., has excellent thermal resistance, can significantly reduce heat loss, thereby improving energy efficiency. 2. The drying capacity is 6 tons / hour, occupying only 6 square meters and a height of 3 meters. The existing single-layer vertical dryer has a low energy utilization rate, so it occupies an area of ​​10-20 square meters and a height of 5-10 meters. Therefore, compared with the existing vertical dryers, the vertical dryer of this technical solution has made great progress in reducing space occupancy.

[0059] In the above detailed description, various features are grouped together in a single embodiment to simplify the disclosure. This method of disclosure should not be interpreted as reflecting an intention that the embodiments of the claimed subject matter require more features than those clearly stated in each claim. On the contrary, as reflected in the attached claims, the utility model is in a state with less than all the features of the disclosed individual embodiments. Therefore, the attached claims are hereby expressly incorporated into the detailed description, with each claim acting alone as a separate preferred embodiment of the utility model.

[0060] The disclosed embodiments are described above to enable any person skilled in the art to implement or use the present invention. Various modifications of these embodiments are obvious to those skilled in the art, and the general principles defined herein may also be applied to other embodiments without departing from the spirit and scope of the present disclosure. Therefore, the present disclosure is not limited to the embodiments given herein, but is consistent with the broadest scope of the principles and novel features disclosed in the present application.

[0061] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only the specific implementation method of the utility model and is not used to limit the protection scope of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A vertical pellet dryer, characterized in that: include: A plurality of independent boxes (3) for accommodating pellets, a hot air intake pipeline (10) connected to the bottom of the independent boxes (3), an exhaust pipeline (1) connected to the top of the independent boxes (3), and an air vent (8); the plurality of independent boxes (3) are arranged in an array, and a box gap (2) is left between every two adjacent independent boxes (3); a plurality of air holes (9) are opened on the wall of the air vent (8), and the air vent (8) extends into the plurality of independent boxes (3) at the same time; a feed port (16) is provided at the top of each independent box (3), and a discharge port (13) is provided at the bottom of each independent box (3).

2. The vertical pellet dryer according to claim 1, characterized in that: It also includes an outer wall (6) sleeved on the outside of the independent box (3), and a side wall gap (5) is left between the outer wall (6) and the outer edge of the array formed by the plurality of independent boxes (3); a top sealing plate (17) is connected between the top of the outer wall (6) and the top of the independent box (3), and a bottom sealing plate (14) is connected between the bottom end of the outer wall (6) and the bottom end of the independent box (3); the exhaust pipe (1) extends into one of the independent boxes (3), the hot air intake pipe (10) is connected to the side wall gap (5), and the end of the air vent pipe (8) is connected to the side wall gap (5).

3. The vertical pellet dryer according to claim 2, characterized in that: There are six independent boxes (3) in total, and the six independent boxes (3) are arranged in two rows and three columns.

4. The vertical pellet dryer according to claim 3, characterized in that: A plurality of ventilation pipes (8) distributed vertically are arranged in the same row, and the ventilation pipes (8) penetrate through the plurality of independent boxes (3) located in the same row.

5. The vertical pellet dryer according to claim 3, characterized in that: A lower connecting sealing plate (15) is connected between the bottoms of two adjacent independent boxes (3), and an upper connecting sealing plate (4) is connected between the tops of two adjacent independent boxes (3).

6. The vertical pellet dryer according to claim 3, characterized in that: A communication hole (20) is provided on the top side wall of the independent box body (3).

7. The vertical pellet dryer according to claim 6, characterized in that: The air permeable tube (8) is formed by connecting a top tube wall (81), a first side tube wall (82) and a second side tube wall (83) in sequence; the top tube wall (81) is an arc-shaped structure protruding upward; the first side tube wall (82) and the second side tube wall (83) are both straight surfaces; and the first side tube wall (82) and the second side tube wall (83) are symmetrical along the mid-vertical plane of the air permeable tube (8); the air permeable hole (9) is provided on the first side tube wall (82) and the second side tube wall (83).

8. The vertical pellet dryer according to claim 7, characterized in that: The included angle between the first side tube wall (82) and the second side tube wall (83) is 45° to 80°.

9. The vertical pellet dryer according to claim 7, characterized in that: Guide plates (7) are provided at both ends of the air vent (8), and the guide plates (7) are arranged obliquely in the side wall gap (5); the side edge of the guide plate (7) located at a higher position is connected to the outer side surface of the independent box body (3), and the side edge of the guide plate (7) located at a lower position is connected to the inner side surface of the outer wall (6); the side edge of the guide plate (7) located at a higher position is higher than the top tube wall (81), and the side edge of the guide plate (7) located at a lower position is lower than the top tube wall (81).

10. The vertical pellet dryer according to claim 1, characterized in that: The discharge port (13) is a conical barrel structure that is larger at the top and smaller at the bottom. A humidity sensor is arranged inside the discharge port (13), and a vibration device (12) is arranged outside the barrel wall of the discharge port (13).

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